The former O.C star sparkled as she showed off the maturer look, a far cry from the tattered, dowdy look she has been sporting of late.

Upcoming star Carey Mulligan, who was nominated for her lead role in last year's film An Education, looked stunning in a strapless red gown.

She was joined by fellow
Brit, veteran actress Dame Helen Mirren who dazzled the cameras in a
floor-length silver dress with drop earrings and a sheer silver shawl.

Not her best side: Kate Hudson laughs as she's cat-called on the red carpet at the Screen Actors Guild awards

Blue was the colour of choice for
actresses Sandra Bullock and Drew Barrymore, while Penelope Cruz played
it safe but still showed off her curves in a little black dress by L'Wren Scott with
peep-toed black shoes.

Mariah Carey committed a fashion faux pas by wearing a figure-hugging dress exactly the same shade of red as the carpet.

Jeff Bridges of Crazy Heart and
Sandra Bullock of The Blind Side claimed the top acting honours,
building momentum for possible Academy Awards glory for the two stars.

Sophisticated: Mariah Carey and Penelope Cruz, L'Wren Scott arrive at the annual TV and film awards

English roses: Carey Mulligan and Dame Helen Mirren bring some British glamour to the event

Meanwhile, Alex Baldwin and Tina Fey won for their roles in the smash hit US comedy series 30 Rock, with Baldwin scooping the prize for Best Actor in a comedy series while Fey walked away with the Best Actress gong.

And the career of former Golden
Girls star Betty White, 88, was celebrated when she was presented with
a Lifetime Achievement Award.

In
another repeat of the Golden Globes, Christoph Waltz was honoured as
best supporting actor for his role as an energetically ruthless Nazi in
the film Inglourious Basterds, while Mo'Nique's searing portrayal of an
abusive mother in Precious was honoured as best supporting actress.

The
cast of Inglourious Basterds, an off-kilter Second World War revenge
saga from Quentin Tarantino, won the award for best ensemble
performance, a possible sign of the film's Oscar chances for a
best-movie nomination and nod for Tarantino.

'It was an honour to be part of it, Quentin,' castmember Eli Roth said in accepting the award for the cast.

The cast of AMC's 1960s Madison Avenue
saga Mad Men won the trophy for best drama series ensemble for the
second year in a row, while 19 cast members of Fox TV newcomer Glee,
about misfits in a high school singing club, accepted the award for
best comedy series ensemble.

Golden Globe winner Michael C. Hall
of Showtime's Dexter, wearing a cap because of treatment he is
receiving for Hodgkin's lymphoma, won best actor in a drama series.

The award for best actress in a drama went to Julianna Margulies of CBS' The Good Wife.

Missed out: Vera Farmiga and Toni Collette, in Rafael Cennamo were both nominated for a SAG award

Kevin Bacon won as best actor in a movie or miniseries for the war-themed series, Taking Chance, while Drew Barrymore received best actress honors in the category for Grey Gardens, about eccentric relatives of Jacqueline Onassis.

Actors in a number of critically acclaimed films went home empty-handed, including "Up in the Air" star George Clooney and the film's supporting actresses, Vera Farmiga and Anna Kendrick.

Clooney, however, was lauded by SAG President Ken Howard for helping organize Friday's telethon to raise money for earthquake-devastated Haiti, a rare reference to the tragedy during the program.

Stunning on both sides: Marion Cotillard shows off her asymmetrical Elie Saab dress